Which of the following does not belong to a group?

Study the following information carefully and answer the given questions: 12 person – Garg, Goyal, Bansal, Kansal, Singhal, Jindal, Bindal, Agarwal, Gupta, Mittal, Jain and Mangal celebrate their birthdays on 5th,15th and 25thof 4 different months – January, February, March and April. Atleast 5 persons celebrate their birthdays between Bindal and Agarwal. Kansal celebrated his birthday after Garg. Gupta celebrates his birthday after both Mittal and Jain. Both Goyal and Bansal celebrate their birthday in a month having 31 days but there is a gap of 20 days between the birthdays of Goyal and Bansal. Only 2 persons celebrate their birthday between Garg and Kansal. 4 persons celebrate their birthday between Mittal and Jain. Number of people celebrating their birthday before Mangal is equivalent to number of people celebrating their birthday after Jindal. Person who celebrates his birthday on 15th March celebrates immediately after Singhal. Agarwal celebrate his birthday before Garg. Only 3 persons celebrated their birthday between Garg and Mangal. Number of persons celebrating their birthday before Bansal is equivalent to number of persons celebrating their birthday after Bindal. Garg celebrated his birthday on 15th of a month having less than 30 days.